Actions

Crushing Bite - Make an attack roll against a chosen target. On a successful hit, the target takes 2d4 Radiant damage and is grappled. While a target is grappled, the Crocodile cannot make another Bite attack or submerge and the target is restrained. The grappled target must make a Strength saving throw against your Spellcasting DC to escape the grapple.  

Bonus Actions

Submerged Prowler - The Astral Crocodile can submerge itself in water or natural terrain, granting it the benefits of Full Cover as a Bonus Action. While submerged, the Astral Crocodile has advantage on Stealth Checks and can take the Hide Action as a Bonus Action. Once the Astral Crocodile attacks, it is no longer submerged.   Tail Whip - The Astral Crocodile can whip its tail at a target that is not grappled by its bite as an attack roll, within 5 feet, and deal 1d4 Radiant damage on a successful hit.

Reactions

Ambush - When submerged, the Astral Crocodile can emerge from water or natural terrain to attack a target that enters within 10 feet of itself as a Reaction and make a bite attack roll for 1d4 Radiant damage.